Cupola or hearth furnace



July 13, 1926. 1,592,520

J. DECHESNE CUPOLA OR HEARTH FURNACE Filed March 10, 1926 Patented July 13, 1926 JOSE]? DECHESNE, Ola RQS'IOCK, GERMANY.

PATENT oFF CUPOLA QRlIEAR'IlH FURNACE.

Application flied latch 10, 1926,. Serlal R6. 93,598, and in Germany January 26, 1925. I

'. of the improvements is to provide a furnace in which gas and other foreign such. as sulfur are separated from t e molten iron. With this object in view my invention consists in providing means for shaking or otherwise agitating the fore-hearth of the cupola or hearth furnace. One way of stir ring'the -fore-hearth consists in uniformly lifting and dropping the same. But I have foundthat the separation of the gas and other foreign matter is made more effective by constructing the "stirring means in such a way that the fore-hearth is lifted to different heights. Thereby the surface of the iron bath is formed into waves of different lengths, and the lengths of the said waves can be regulated so that the successive Waves impinge upon each other and are stren thened, so that the agitation of the iron bath is comparative] vivid.

For the purpose 0 explaining the invention an example embodying the same has been shown in the accompanying drawing, in which the same reference characters have been used in all the views to indicate corresponding parts.

In said drawing,

Fig. 1 is a sectional elevation showing the bottom part of the cupola furnace, the forehearth and means for agitating the same, and

Fig. 2 is an elevation left in Fig. 1.

In the example shown in the figures the cupola furnace a is provided with conduits c and tuyeres d for supplying air thereto,

looking from the and with a tap hole 6 for delivering the molten iron to the top art of the forehearth f. The fore-hearth is covered by a lid g, and it is provided at its bottom with a tap hole h. The pipe e forming the tap hole of the' cupola furnace has a certain clearance in the wall of the fore-hearth f.

At the side of the cupola furnace the forehearth f is supported b means of spherical pivots 1' on bearing bloc s k, and at its front side it is supported on a pair of cam disks m carried by a rotary shaft 12. Preferably the cam disks are mounted on the shaft so as to be adjustable thereon. The shaft 10. is

' mounted in bearings o, and it is adapted to be rotated by means of a belt-pulley As shown, each cam disk m is provide with matter .by the agitation of the fore-hearth if 'fore-hearth. By the rotation of the shaft n the fore-hearth f is alternately elevated and dropped at its front end by the cam disks m, and it isrocked about the bearing blocks is. The fore-hearth is elevated by the cams 1- to agreater height than by the cams .2.

After tapping the fore-hearth f the iron coming from the cupola furnace b is stirred and the particles of iron are whirled relatively to one another, so that the gas contained within the iron rises to the surface thereof and the manganese molecules are brought into contact with the sulfur-molecules. and the sulfur manganese slag arises to the surface.

Since this agitation takes place while the iron rises within'the fore-hearth f, the gas and slag are separated at the surface of the bath, so that the resistance opposed thereto is comparatively small. Further, the temperature of the iron bath is maintained, be-

,bath which is subject to the most vivid agitation.

The waves produced by the cams r and .9 within the bath of iron have different lengths, so that the whirls are strengthened by interference of the Waves of different lengths meeting each other. The said whirls can be controlled by providing cams of different sizes and different relative positions.

I am aware that it has heretofore been proposed to separate gas and other foreign matter from the iron by stirrin the same in ladles. But I have found t at in my improved furnace the separation of the said foreign matter is more effective for the following reason The fore-hearth is directly connected with said furnace is continuously hearth the gases of the cupola furnace flow over the iron and keep the same at high temperature. At such high temperature the gas is readily separated from the iron, and

. a large .proportionof the surfur is bound to the manganese, the proportion being conside'rably higher than in ladles in which the iron is gradually cooled: and crystallized, the reductionof the temperature interferr gases. Further, as the fore-hearth is gradually filled the lower layers of the bath of iron are always freed ofthe gas and other impurities,fwhile the upper layersof the bath which have been recently delivered into the fore-hearth are? not yet freed of the gas and the impurities. Now, when shakingthe fore-hearth, the uppermost layer of thebath is subject to vigorous agitation, so that the particles of the iron are stirred and almost all the molecules of manganeses are brought into contact with the sulfur molecules. vFurther, the path of the slagv of sulfur manganese and the gas through the bathof iron is comparatively small,

.so that the resistance opposedto the separation of the said slag and gasis small.

While in describing the invention reference has been made to a articular example embodyingthe same I w1sh it to be understood that my invention-is not limited to the construction shown in the 'dra'win and that various, changes may be made In the general arrangement of the apparatus. and

the construction of its parts without dep parting from the invention.

I claim:

1. The combination with a furnace for melting metal, of a fore-hearth directly connected with saidfurnace for receiving the molten metal therefrom, and means to shake the said fore-hearth. v

2. The combination with :a furnace for melting metal, of a fore-hearth directly connected with, said furnace for receiving the p p 'molten' metal therefrom, andmeans to'iming with the separation of the'sulfur and ot e art varying agitating movement to the ore-hearth.

' 3. The combination with, a furnace for melting metal, of a fore-hearth directly connected with said furnace forreceiving the molten metal therefrom, andme'ans for successively lifting and dropping the forehearth.

4. The combination with a furnace for melting metal, of a fore-hearth directly connected with said furnace for receiving the molten metal-therefrom, and means for successively lifting the fore-hearth to different .heights' and dropping the same.

5. The combination with a furnace for melting'metal, of a fore-hearth directly connected with said furnace for receiving the molten metal therefrom. said fore-hearth being ro ckingly supported at the side of the furnace, and means for successively elevating and dropping the fore-hearth at its front end.

In testimony whereof, I hereunto afiix-my v "JOSEF DECHESNE.

signature. 

